Jack



L. G. FISCHER.

JA'CK.

APPLICATION FILED DEC. Il, 1919.

Patented Dec. 28, 1920.

2 SHEETS-SHEET i.. G. FISCHER.

. JA'CK. 1,363,240. APPLICATION man 05cm, 1919. Patented Dec. 28 lggo' z SHEETS-SHEET 2.

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UNITED ST'l'ES raient orFicE:

LOUIS Gv. FISCHER', OF PITTSBURGH, PENNSYLVANIA.

JACK.

T o all 'whom t muy concern Be it known that l, Lotus GFISCHER, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented -cerA tain new and useful Improvements in Jacks,`

of which the following is a specication.

This invention relates to jacks, and more particularly to a jack which may be used for jacking up automobiles and for similar purposes, and may be readily connected into a hoist. y

One of the main objects of the invention is to provide a jack of simple construction and operation capable of producing a great lifting force. A further object is to provide operating means so constructed as to be at all times effectively locked against reverse operation. Another object is to provide simple and eflicient means for readily connecting the jack into a hoist. Further objects will appear from the detailed description.

ln the drawings 1- Figure 1 is a back view of a jack, with the operating-wheel removed, constructed in accordance with my invention.

Fig. 2 is a section taken substantially on line 2 2 of Fig. 1.

Fig. 3 is an inside face View of the operating wheel.

Fig. 1 is an outside face view of the same.

Fig. 5 is a section taken on line 5-5 of Fig. 4l.

Fig. 6 is a central sectional view through the hoisting sheave.

Fi 7 is a section taken substantially on line -7 of Fig. 2.

Fig. S is a front view of the operating lever.

Fig. 9 is a side view of the same.

Figs. 1() and 11 are diagrammatic views illustrating the operation of the lever,

Fig. 12 is a front view of the hoisting chain guide. i

Fig. 13 is a section on liney 13-13 of Fig. 12.

Fig. 14 is a plan view of the lifting toe.

Fig. 15 is a side view of the toe.

Fig. 16 is an inside face view 'of the same.

Fig. 17 is a central sectional view through a modified operating wheel.

Fig. 18 is a front view of a modified operating lever usable in connection with operating wheel shown in Fig. 17.

Specification of Letters Patent.

Patented Dec. 28, 1920.

Application led December 11, 1919. Serial No. 344,175.

The jack is provided with a hollow standard 1 which slidably receives a bar 2 of .channel cross section having teeth on the inner face of its bight portion forming a rack B. This teeth rack terminates an appreciable distance from head 4t of the rack so as to leave a space 5, and downward travelrof the bar is limited by a pin 6 i11- serted through the arms thereof with its ends projecting beyond the sides of the bar for contact with the upper end of the standard. This pin, by limiting downward travel of the bar, insures that rack 3 will normally mesh 'with a spin gear 7 secured on a shaft 8 rotatably mounted in the front wall of the standard. This gear projects beyond the front of the standard and meshes with a spiral thread orrib 9 formed on the inner vface of an operating wheel 10 rotatably mounted on a stub shaft 11 secured in and projecting from the front wall of the standard.

l/V heel 10 may be intermittently rotated in either direction by means of a lever 12 (Figs. 8 and 9) placed upon stub shaft 11, this lever being provided at its inner end with an opening 13 of greater diameter than the shaft and having two pairs of lugs 14 at its lateral edges adapted to fit about flange 15 of the wheel. By shifting the sol lever on the shaft so that its longitudinal axis is eccentric to the axis of the shaft, either `two of the diagonally opposite lugs 1d may be caused to bite into and grip the flange of the wheel, as indicated in Figs. 10 and 11, for intermittently rotating the Wheel in either direction. When the wheel 10 is thus rotated comparatively great force s applied to bar 2 for raising' the same through the medium of thread 9, gear 7 and rack 3. To permit ready adjustment of bar 2, hub 16 of wheel 10 is knurled (Fig. el) to provide an effective grip by means of which the wheel may be readily turned directly by hand.

To permit the jack to be applied to objects positioned close to a supporting surface, l provide a toe piece 17 which is positioned closely adjacent the lower end of bar 2 and normally fits into a correspondingopening 18 provided in base 1aq of the standard. This toe is provided with a rectangularly disposed shank 19 having a keyhole slot 20 which receives a headed screw 21 is further provided on its inner face with two lugs 22 which bear against the bight of the rack bar and act as spacing members to hold shank 19 out of contact with the lateral portions of the back wall of the standard which is provided with a vertical slot 23 to accommodate movement of the toe and associated parts with bar 2. To relieve pin 21 of strain, the lower lug 22 rests upon a lug 24 projecting from the `lower end of the bight of the bar, as in Fig. 2.

Wheel 10Vis adapted to snugly receive a chain-sheave 25 provided in the inner face of its flange with spaced recesses 26 into which'snugly t lugs 27V projecting radially from wheel 10. This sheave is provided with a central opening for reception `of shaft 11 as indicated in F ig. 6. 1n practice,

the lever 12 is removed and the sheave is fitted snugly about wheel 10, a two armed chain guide 28 being then placed upon the shaft adjacent the outer face of the sheave and cotter pin 29 inserted through the shaft to prevent outward movement of either the sheave or the. guide. A chain is then passed over the sheave, the runs of the chain passing through eyes 30 at the outer ends of the arms of the guide. A chain 31 of suitable length is then passed about chain hubs 32 secured on the ends of shaft 8, the runs of the loops of this chain passing through guide eyes 33 carried by base 1a and so positioned as to insure proper engagement of the chain with the chain hubs. The two front runs of the chain may carry a pulley block with a hook, or any other suitable means may be employed for attaching chain 31 toA the load. After this has been done, toe 17 is removed and pin 6 is withdrawn so as to permit lowering of bar 2 sufficiently to bring space 5 opposite gear 7 thus disengaging rack 3 from the gear. By suspending the jackfrom any suitable support, by means of a bail 34Vprovided for this purpose and secured at its ends to a heavy rod or pintle35 inserted through the top of the front "wall of standard 1, the jack may be used as hoist.- When theV jack is thus suspended, wheel `1() may be rotated by pulling on the hoisting chain so as to rotate sheave 25,` this rotationrof the wheel serving to ro* tate hub sheaves 32 so as to raise the load. This provides very` simple and efficient means whereby the jack may be used as a lifting jack in the ordinary manner, or may be readily converted into a hoist.

"As shown ,in Fig. 17 chain sheave 25 may be eliminated by placing the chain pockets directly upon the flange of operating wheel 10. Said flange is then widened a sufficient amount to provide the necessary gripping space for lugs 14 of operating lever 12.

Also, if'so desired, the construction of this .Y operating lever` may be modied as shown in Fig. 18 in which a single lug 14EL lits into the chain pockets of the operating wheel and an oblong hole 13, slightly wider than the dameter of stub shaft 11, enables the engagement or disengagement of lug 14a with or from the chain pocketsby moving the lever lengthwise.

is will be understood, it may be found by experience desirable to resort to slight modicatioiis in construction and arrangement of details of the invention, and 1. in-

tend to include all such variations, as fall within the scope of the appended claims, in this application in which a preferred form only of my invention is disclosed.

What I claim is: Y

1. lncombination, a standard, a lifting. bar operable therein vand provided with, a`

rack, a shaft rotatably mounted in the standard, a gear secured on said'shaft, saidI 3. ln (combination, a standard, a lifting bar operable therein and provided with a rack, a shaft rotatably mounted in the standard, a gear secured on said shaft, said bar being adjustable so as to move the rack into or out of mesh with the gear optionally, chain hubs secured on the shaft, a rotary operating wheel provided with a spiral thread meshing with said gear, and means for ro tating said wheel in either direction.

4. In' combination, a standard, a lifting bar operable therein and provided with a rack, a shaft rotatably Amounted in the standard, a gear securedon said shaft, said rack being discontinued a suflicient distance from the top ofsaid lifting bar to provide disengagement of said gear and said rack when said lifting bar is dropped into nonoperative position, a chain hub securedon each end of said shaft and outside of said standard@ rotary operating wheel provided with a spiral thread meshing with said gear, means for rotating said wheel ,in either direction when load is applied onsaid lifting bar and means for quick rotation of said wheel in either direction when Vnot loaded.

5. 1n combination, a standard, a lifting bar operable therein and provided with a rack, a shaft rotatably mounted in the standard, a .Q'ear securedonV said shaft, said bar being adjustable so as to move the rack into or out of mesh with the gear optionally, a chain hub secured on each end o1" the shaft, and outside of said standard an operating Wheel provided on one face With a spiral thread meshing with said gear.

6. In combination with a jack, a lifting bar, means for operating said bar, the bar being adjustable into and out of operative relation to said operating means, and means associated with the operating means for 10 Converting the jack into a chain hoist.

In testimony whereof I affix my signature4 LOUS Gr. FISCHER. 

